Positive pressure batching machine real-time monitoring and database management (SCADA) and other upper computer application software, can save the product formula, silo data, real-time data, etc., and can realize the historical data query, report printing, real-time data and status display, remote control and other functions, the two upper computer digital digging library can be effectively kept in synchronization. The main control program of PLC of the lower machine, as well as the communication, dosage precision control and dosage truck walking subroutine are designed. Aiming at the dosage fallout control problem commonly existed in the Dosage system, the positive pressure dosage machine adopts a composite predictive control algorithm based on adaptive combined with PID, the algorithm organically combines the characteristics of adaptive control with wide-range rapid adjustment, when the deviation of the system is larger than a certain set value, the adaptive rule control combined with human experience is used, and when the deviation of the system is smaller than the set value the PID control is used. The two inputs of the controller are the system expectation value and deviation, and different air fall is predicted by different expectation values, and the effectiveness of the method is proved by experiments.

The automatic dosage system consists of storage hopper, feeding device, hopper scale, main conveying device, transverse positive and negative conveying device, calibration scale, control cabinet and computer control system. The upper computer transmits the raw material formula data to the lower PLC. Various kinds of raw materials are distributed into the corresponding batching silo for storage through the roof conveying equipment and distributor. The raw materials are sent to the hopper scale by the Feeder respectively in sequence during dosing. Raw materials with large proportion (>20%) are sent to the large hopper scale; raw materials with small proportion (5%~20%) are sent to the small hopper scale for weighing. The weighing module detects the quantity of each material and transmits the signal to the weighing controller to control the feeding of the feeder, thus controlling the dosing of each material. When all the materials in the silo are weighed and dosed according to the set recipe requirements and reach the specified cumulative quality (quantity of each batch), the PLC opens the material door according to the control program and puts the materials in the hopper scale into the mixing chamber of the feeder for stirring and mixing. Mixing machine to achieve a predetermined mixing time, that is, when the mixing uniformity to meet the requirements, under the control of the PLC, the material door opens out of the material to the buffer bin, the material falls into the finished product scraper conveyor, sent to the bucket elevator inlet elevated to the mixing bin storage, to the next process.

1) Feeding device for the spiral winch cage, belt special feeder, and the lower part of the storage hopper connected together, the raw material is transported to the dosage of Electronic scales.

2) It consists of weighing instrument, weighing module, hopper, junction box, cylinder, etc. When the material is added to the hopper through the winch cage, the sensor undergoes elastic deformation and transmits the signal to the weighing display instrument, and at the same time transmits the data to the computer. When the material is added to the predetermined value, the weighing door will be opened, and the material will be unloaded onto the belt conveyor automatically.

4) The feeding device is a sealed belt conveyor. The transverse forward and reverse conveyor conveys the allocated material to the compound scale (mixer) according to the instruction issued by the computer.

5)After the conveyor sends the material to the calibration scale, the calibration scale calibrates the total weight in the formula.

6)The control cabinet is the electrical control mechanism of the whole system, automatic mold casting batching line offer, consists of programmable controllers, control software, frequency converter, intermediate relay, AC contactor, buttons, signal lamps and so on.

7) Computer control system is the control center of the whole system, which is composed of industrial computer, communication board, control and management software, etc. It is responsible for receiving signals from each automatic Weighing system, issuing various control instructions according to the requirements of formula, automatic batching line offer, and also has the functions of formula management and data management.